Unauthorized 1040 Amendment Filed May 2023 - Refund Frozen Since March - IRS Shows "No Tax Return Filed"

I just found out my taxes were amended and I never requested it. Someone filed an amendment without my permission and now my refund is delayed. I'm beyond frustrated with this whole situation. I checked my IRS account transcript today and discovered that on May 27, 2023, there's a transaction code 977 "Amended return filed" in my account. I NEVER filed an amendment! There's also a code 971 from the same date showing "Amended tax return or claim forwarded for processing." What's even more concerning is that there's a code 810 from March 10, 2023 showing "Refund freeze" for $0.00. My account transcript shows a balance of $0.00 with no accrued interest or penalties as of June 20, 2023. My tracking number shown is 43277-550-06373-3, and this is for my 2022 tax return where I filed as Head of Household. Interestingly, it says "RETURN NOT PRESENT FOR THIS ACCOUNT" under some of the sections, and at the top it shows "No tax return filed" despite the amended return codes. Has anyone dealt with this type of tax identity theft before? I'm really worried that someone has stolen my information and is trying to claim a fraudulent refund. Should I call the IRS identity theft hotline? Visit a local office? File a police report? Any idea on the timeline for resolution on something like this? Will they automatically investigate or do I need to be proactive? I filed my legitimate return months ago and was expecting my refund, but now everything is delayed and I don't know what's happening.